MATLAB将两个数组（一个字符串单元格和一个数值向量）附加到一个.csv中

Question

I have two arrays, X and Y

X has numeric data like this:

12342 1355 2324 ...

Y has strings like this:

APPLE METRO BLANKET ...

I want to append these arrays into a pre-existing .csv in this format:

X(1,1), Y{1,1} X(2,1), Y{2,1} X(3,1), Y{2,1} ...

How should I do so?

Answer 1

unfortunately writing cell arrays to csvs can be tricky. One way or another you need to loop through so you can access the data within each cell. The reason for cells not writing automatically is that a cell can contain anything - like a whole matrix of data.

The most versatile way that will allow for any types of cell/matrix combos is to use fprintf - you just need to specify a format. http://au.mathworks.com/help/matlab/ref/fprintf.html

nrows = size(x,1);
fid = fopen('newfile.csv','w');
for aa = 1 : nrows
    fprintf(fid,'%f,%s\r\n', x(aa,1), y{aa,1});
end

you can use %d instead of %f if you are only chasing decimal numbers instead of floating point precision.

I have found fprintf to be faster than any of the alternatives for this sort of situation. It is a little more low-level but allows you to write anything you like to file.